Method for preparing nonwoven tube enhancement type polyvinylidene fluoride hollow fiber membrane

A polyvinylidene fluoride and fiber membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of low strength of polyvinylidene fluoride hollow fiber membranes and difficulty in meeting requirements, and reach the contact point Many, the preparation process is simple, and the effect of tight combination

Inactive Publication Date: 2008-08-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyvinylidene fluoride hollow fiber membrane prepared by the general method has its strength performance and separation and permeation performance concentrated in the membrane body at the same time. Difficult to meet requirements

Method used

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  • Method for preparing nonwoven tube enhancement type polyvinylidene fluoride hollow fiber membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1. Take 20 g of 100D / 48F polyester staple fiber with a length of 2 mm, mix it with 0.1% PMMA solution with a concentration of 20 kg, and stir to obtain a uniform single fiber slurry.

[0017] 2. Utilize the tube mold to make the non-woven tube blank, carry out plate rolling and drying on it. A nonwoven tube with an outer diameter of 2.8 mm to 3.2 mm was obtained.

[0018] 3. Mix 10g of polyurethane with 90g of DMAc, and fully dissolve the polyurethane at 100°C to obtain a 10% polyurethane adhesive.

[0019] 4. Immerse the non-woven tube blank prepared in step 2 into the polyurethane adhesive prepared in step 3. After 3 seconds, take it out and put it in water. The fiber layers of the non-woven tube are bonded and consolidated together to obtain a reinforced non-woven tube. Tube.

[0020] 5. The reinforced non-woven tube prepared in step 4 is baked at a temperature of 550° C. for 3 s to obtain a re-reinforced non-woven tube with a wall thickness of 0.3 mm and an outer ...

Embodiment 2

[0025] 1. Prepare a non-woven tube with the same raw material quality and operating conditions as steps 1-6 in Example 1.

[0026] 2. Take 50g of polyvinylidene fluoride, 425g of N,N-dimethylacetamide, and 25g of polyvinylpyrrolidone, add them to the melting material tank, stir at 60°C for 8 hours, let it stand for defoaming after dissolving, and obtain a film-making solution .

[0027] 3. Immerse the re-enhanced non-woven tube prepared in step 1 into the film-making solution prepared in step 2. After the soaking is complete, take it out and immerse it in water at a temperature of 20°C, soak it under normal pressure for 48 hours, take it out and dry it naturally to obtain a non-woven tube Reinforced polyvinylidene fluoride hollow fiber membrane.

[0028] The performance parameters of the non-woven tube-reinforced polyvinylidene fluoride hollow fiber membrane prepared through the above steps are: the membrane pore diameter is 0.42 μm, the outer diameter is 2.7 mm, the wall thi...

Embodiment 3

[0030] 1. Take 20g of 100D / 48F polyester staple fiber with a length of 2.5mm, mix it with 20kg of 0.1% PMMA solution, and stir to obtain a uniform single fiber slurry.

[0031] 2. Utilize the tube mold to make the non-woven tube blank, carry out plate rolling and drying on it. A nonwoven tube with an outer diameter of 2.9 mm to 3.3 mm was obtained.

[0032] 3. Prepare a re-reinforced nonwoven tube with an outer diameter of 2.5 mm by the same procedures as steps 3-5 in Example 1.

[0033] 4. Take 50g of polyvinylidene fluoride, 425g of N,N-dimethylacetamide, and 25g of lithium chloride, add them to the solvent tank, stir at 60°C for 8 hours, let it stand for defoaming after dissolving, and obtain a film-making solution .

[0034] 5. Immerse the re-enhanced non-woven tube prepared in step 3 into the film-making solution prepared in step 4. After the soaking is complete, take it out and immerse it in water at a temperature of 20°C, soak it for 48 hours under normal pressure, ta...

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Abstract

The present invention provides a preparing method of nonwoven tube enhanced PVDF hollow fibre microporous filtering film. The method includes: the fiber slurry is obtained by dispersing polyester staple fibre having a certian lenght to polyacrylamide solution, the nonwoven tube blank is obtained by tube mould, the enhanced nonwoven tube is obtained by grinding, adhesive and baking processing; a film liquid is obtained by using PVDF as film material, using N, N-dimethylformamide as solvent, using kollidon as additive, according to a certain mass ratio of PVDF, solvent and additive; the enhanced nonwoven tube is dipped in the film liquid to process coating, solidify, obtaining enhanced hollow fiber film. The advantages of the invention is the simple process, high strength of the enhanced hollow fiber film, the water flux is 450L / m2.h-950L / m2.h.

Description

technical field [0001] The invention relates to a preparation method of a non-woven tube reinforced polyvinylidene fluoride hollow fiber membrane. It belongs to the preparation technology of high-strength hollow fiber membrane. Background technique [0002] Polyvinylidene fluoride is increasingly widely used in membrane separation technology due to its excellent corrosion resistance, solvent resistance, weather resistance and mechanical properties. Polyvinylidene fluoride hollow fiber membranes have good applications in wastewater treatment, domestic sewage reuse and reverse osmosis water pretreatment. During these processes, the hollow fiber membrane is continuously subjected to the impact of water flow during use and cleaning, so it needs to have high strength to ensure its normal operation, which is especially prominent in the submerged membrane module. However, the polyvinylidene fluoride hollow fiber membrane prepared by the general method has its strength performance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D69/10B01D71/34
Inventor 李凭力吴浩赟常贺英解利昕王世昌
Owner TIANJIN UNIV
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